VizieR Online Data Catalog: Delta Scuti variables. II. DY Her (Milone+, 1994)
Abstract
This is the second paper in a series on large-amplitude delta Scuti stars intended to determine Baade-Wesselink radii and luminosities with precision. The first paper (Wilson et al., 1993PASP..105..809W) discussed our method of analysis and its application to EH Librae; in this we discuss the observations and analysis of DY Herculis. Optical and infrared photometry and cross-correlated radial-velocity data have been obtained and analyzed. Fourier representations for the UBVRIJHK light curves and for the radial-velocity curves were used to derive a value for the minimum radius for each of 60 combinations of flux and color index. From these we adopt a mean value for the minimum radius of Rmin=2.77+/-0.20R⊙. When combined with effective temperatures from Breger et al. (1978PASP...90..754B), we find a mean bolometric luminosity of <LB>=21.70L⊙ and a mean absolute magnitude of <MB>=1.41. The radial excursion is 0.149R⊙. We use the same procedure to improve our results for EH Librae, deriving Rmin for each of 42 combinations of flux and color index, and obtain mean values of Rmin=2.62+/-0.19R⊙, <LB>=24.56L⊙ and <MB>=1.27. (3 data files).
- Publication:
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VizieR Online Data Catalog
- Pub Date:
- February 1995
- Bibcode:
- 1995yCat..61061120M
- Keywords:
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- Stars: variable;
- Photometry: UBVRIJKLMNH